Evolution of iodine from $NaI-Na_2 O_2$ System

Sodium을 냉각제로 사용하는 증식원료로계(LMFBR)에서 원자로의 정상, 비정상 가동하에서 Sodium 또는 Sodium화합물과 핵분열물질의 하나인 기체상 I$^{131}$ 의 역활은 장해도평가에 중요한 요인이 된다. 본 실험에서는 Sodium peroxide계에서 시간, 온도, flow rate에 따른 I$^{131}$ 의 방출과정을 규명하였음.

The evolution of radioiodine 131I from a sodium peroxide system as a function of time, temperature, and carrier gas (nitrogen) flow rate was studied. Virtually no iodine was volatilized at 25$0^{\circ}C$ and a very small amount, of the order of 10$^{-3}$ % per flour, at 63$0^{\circ}C$. Substantially greater amounts of iodine were volatilized at 7$25^{\circ}C$ and 83$0^{\circ}C$. The data are consistent with the hypothesis that the mechanism of transfer is distillation of sodium iodide, and that elemental iodine is not produced in this system.